My apologies, it was early when I replied. The process I gave is exactly the 
same, but choose "aggregate device" instead. Then, that second table will show 
input devices, not output ones, and you check the ones you want. The trick here 
is that your device will have as many channels as the total of the devices; a 
stereo mic plus a mono mic will have three channels altogether, for instance, 
so you will need to ensure your software can handle multiple channels like that 
and select the proper number i it can.
On Sep 29, 2014, at 1:03 PM, Jonathan Mosen <[email protected]> wrote:

> Thanks Alex, but based on your description, this sounds like it relates to 
> output, rather than input? What I'm after is the ability to record from two 
> devices simultaneously rather than play them back. Can you also use a 
> multi-output device for input?
> Jonathan Mosen
> Mosen Consulting
> Blindness technology eBooks, tutorials and training
> http://Mosen.org
> 
>> On 30/09/2014, at 12:48 am, Alex Hall <[email protected]> wrote:
>> 
>> I may be too late for your conference, but hopefully this will help in the 
>> future.
>> 
>> First, you'll want to make a multi output device in the Audio Midi Setup 
>> app. Launch the app, find and activate the "Create New Device" menu button, 
>> choose "multi-output device" from the menu, and a new device will be placed 
>> in the devices table near the top of the window. Select that device, then 
>> find the unlabeled table further along. This table lists all the output 
>> devices on the computer; check the box next to all the ones you want to use 
>> and that should be it. You can now switch to that device (remember to set 
>> VoiceOver however you need to so you'll still have speech, or leave a 
>> display connected).
>> 
>> As to quickly switching, I imagine there's a utility for that, possibly on 
>> MacUpdate.com. If not, AppleScript may be able to do the job, though I've 
>> never looked into that possibility.
>> On Sep 29, 2014, at 3:37 AM, Jonathan Mosen <[email protected]> wrote:
>> 
>>> Hi everyone. Wondering if anyone can help me with a query.
>>> I'm going to be streaming a conference shortly, and won't be using a 
>>> hardware mixer as I don't have one that's portable and don't have a need 
>>> for a portable option often enough to justify buying one.
>>> I'll  be providing commentary via my Blue Yeti microphone. I then want to 
>>> switch to the house audio, which will be coming in via a line in to my 
>>> sound card. The Yeti and the sound card are two separate input choices 
>>> under System Preferences.
>>> I have a couple of questions about this set-up in a mac context.
>>> First, I believe it is possible to combine separate inputs into one virtual 
>>> sound device? Since both the Yeti and the sound card have adjustable 
>>> inputs, I may be able to have them both going at once and manage them via 
>>> their respective input controls. Any advice on if this is possible, and if 
>>> so, how, is much appreciated.
>>> Second, if this isn't possible, do utilities exist that allow you to switch 
>>> inputs via function keys or some other method more easy than changing the 
>>> input in System Preferences? I would love to be able to switch from one 
>>> input to another at the touch of a button.
>>> Any help very much appreciated. Thanks a lot.
>>> Jonathan Mosen
>>> Mosen Consulting
>>> Blindness technology eBooks, tutorials and training
>>> http://Mosen.org
>>> 
>>> 
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>> --
>> Have a great day,
>> Alex Hall
>> [email protected]
>> 
>> 
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> 
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Have a great day,
Alex Hall
[email protected]

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